Abstract
Introduction of an electronic feedback loop into photorefractive (PR) wave-coupling schemes makes them noise-free and leads to dramatic changes of the nonlinear behavior. The familiar steady states can be transformed into periodic states that are characterized by ultimately high/low values of the diffraction efÞciency or into quasi-steady states with small values of. These transformations possess thresholds with respect to control experimental parameters (the coupling strength and the input intensity ratio). We present an analysis of the threshold behavior for different modes of the feedback operation and different types of the PR response. The results obtained allow to predict the regions of stability for feedback-controlled steady states and the observable characteristics of the system, including the output amplitudes and diffraction efÞciency.
© 2005 Optical Society of America
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